I have realised the problem here

[Florian Müllner]

On Tue, May 2, 2017 at 11:28 PM Diego Fernandez <aiguo.fernandez at gmail.com>
wrote:

> However, there's a simple solution:
> https://extensions.gnome.org/extension/15/alternatetab/
>

Or simpler:
$ gsettings set org.gnome.desktop.wm.keybindings switch-applications "[]"
$ gsettings set org.gnome.desktop.wm.keybindings switch-windows
 "['<Alt>Tab']"

The extension really just exists to have a different Alt+Tab default in
GNOME Classic, all the actual functionality is implemented in gnome-shell
itself.
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